First of all, isles were liberated by an asspull with random name, not thanks Vol'jin that only led whole army into the trap.
In Undercity, he was just sitting in a demolisher, didnt even go inside.
In 4.1 (not 4.2), he just sent warning and opened gates to ZA.

Vol'Jin did warn us of the Trolls not himself maybe but via other Trolls. He has done some things weather you like him or not. Hate be damned.

Blizzard do not destroy Jaina Proudmoore's character. Make her who she once was, not full of rage and vengeance.,If you are curious about me or about my writing aspirations, feel free to pst me. Paladin-Sorcerer at your service! My Youtube Channel https://www.youtube.com/user/Aeluron Big fanboy of Yrel now. Love her now

I am thinking over the course of this story arch that each race is going to do a little shining of their own and state they don't want another Garrosh situation. With that and the bloodelves beign the way they are I would almost say they might try to press towards a more democratic method of leadership. Or say like treating the Horde like the U.N. but the orcs are probably going to be the United States of the group.

Garrosh's cronies have been going around silencing any orcs who dare voice any disagreements about Garrosh. It's not that surprising that there's few orcs openly criticising him.

One of the reasons Garrosh was chosen was because he was popular and praised as a war hero of old by the Orcs after the Northrend Campaign. The Orcs also agreed with him enough to initiate the major offensives we see in Cataclysm.

His silencing of Orcs who speak out against is more or less him mopping up his idea of the Horde.